Tunable and Reconfigurable Microwave Photonic Filter Implemented by Cascaded Mach-Zehnder Modulators and a Dispersive Medium
A novel tunable and reconfigurable microwave photonic filter based on two cascaded Mach-Zehnder modulators (MZMs) and a dispersive medium is presented, theoretically discussed and experimentally demonstrated. A single-wavelength laser diode (LD) and the first MZM are used to obtain a multi-wavelength optical source, and the second MZM is modulated with the signal to be processed. The dispersive medium provides the time delay for different taps, since different wavelength experiences different time delay, when it travels in the optical fiber. By adjusting the modulation frequency and the bias voltage on the first MZM, the wavelength spacing and the relative amplitude of the optical tones after the first MZM can be changed, thus making the filter tunable and reconfigurable. The presented microwave photonic filter has been implemented in the experiment. The experimental results agree well with the simulation results, and show that the present microwave photonic filter has good tunability and reconfigurability. The mainlobe-to-sidelobe ratio (MSR) of around 25dB is achieved for the presented filter in the experiment.
Mach-Zehnder modulator dispersive medium microwave photonic filter multi-wavelength optical source optical carrier suppression and Radio-over-Fiber systems.
Hongyan Fu Haiyan Ou Kun Zhu Edvin Remb Sailing He
Center for Optical and Electromagnetic Research,State Key Laboratory of Modern OpticalInstrumentation,Joint Research Center of Optical Communications of Zhejiang University andRoyal Institute of Technology (Sweden),Zhejiang University,Hangzhou 310058,
国际会议
2008亚太光通信会议(Asia-Pacific Optical Communications 2008)
杭州
英文
2008-10-26（万方平台首次上网日期，不代表论文的发表时间）